Playing any video regardless of source is one of the most processor-intensive tasks you can throw at a computer. The demands on the CPU and the graphics processor are high. I'm reasonable sure the heating you see is normal.
The case bottom is part of the heat dissipation system and is designed to get hot so air moving under the case takes away the heat. Apple recommends not using their notebook models in your lap without a lapboard because that blocks one of the main cooling systems.
Are you using an external monitor with the Powerbook's lid closed (clamshell more)? If so, don't close the lid on the PowerBook; heat also escapes from the keyboard area
Notebooks in general run hot due to limited space inside that restricts the size fans that can be used. It's important to know that what "feels" hot is not necessarily dangerous to he computer. You need to get a temp monitoring utility to see actual numbers. Most notebooks will do a safety shutdown if the internal temps approach 100°C/212°F.
I like this free temp monitor:
Thank you Allan,
I do not use an external monitor so the PowerBook lid is open. Using this PowerBook as a DVD player is a new
activity; the laptop was sitting idle. Rather than buying a portable 9" Sony DVD player, I decided to get some use
out of the older laptop, plus have a larger good quality display. I will elevate the PB on a book rack to allow for
adequate dissipation of the heat generated by the disc drive. Your advice resolved this issue. VG
I was given my 17-inch 1ghz PowerBook by a friend who said it was worn out and not worth fixing. In a day I had it purring along but he had managed to knock off the little rubber feet from the bottom, and replacement feet were expensive.
I bought a card of stick-on silicone rubber drawer bumpers at the hardware store and used those for feet. They are about 1/4-inch (6mm) thick so allow more air under the case than the original feet.
Cleaing out some old stuff from teh playroon, I found a set of interlocking plastic blocks our kids played with as toddlers (our youngest is now 26!). They are about 5/8-inch thick. Four stay in my backpack for use as a stand for my MacBook Pro (gets even hotter than the PBG4) when I travel.
Ther are a lot of ways to help cooling and the neat thing is that many are cheap or free!
Great idea Allan,
Sounds like the amazingly versatile Legos block, or a similar plastic block, has come to the rescue; along with
the small stick on silicone drawer bumpers. I will head to Lowes and buy some later. Simple, and little, seems
to solve many problems, throughout history, in general.
I had considering using a cake rack but grill marks on the palms is not cosmetically correct. I have not played
DVDs on my MacBook Pro so I have not noticed a bottom heat issue.
Thank you again. VG